Water purifier with electrodialysis function and water purification system

Abstract

The present application relates to water purification technical field, especially a kind of water purifier and water purification system with electrodialysis function.The water purifier includes electrodialysis water purification filter element, drinking water pipeline and membrane filter element, and the electrodialysis water purification filter element includes cathode, anode and ion exchange module, and the ion exchange module is placed between the cathode and the anode;Divalent cation chamber and monovalent cation chamber are formed in the ion exchange module, the water inlet end of the divalent cation chamber and the monovalent cation chamber is connected with the pure water outlet of the membrane filter element, and the water outlet end of the divalent cation chamber is connected with the drinking water pipeline;Under the electric field effect of the anode and the cathode, monovalent cation in the divalent cation chamber migrates to the monovalent cation chamber, and divalent cation in the divalent cation chamber remains.The monovalent cation in the divalent cation chamber is moved forward to the monovalent cation chamber, and the monovalent cation and divalent cation in water are separated, so as to change water quality.

Description

Technical Field

[0001] This invention relates to the field of water purification technology, and in particular to a water purifier and water purification system with electrodialysis function. Background Technology

[0002] As people's living standards improve, they are paying more and more attention to water quality and hygiene, and equipping households with water purification equipment has become a trend. Existing water purification equipment can conveniently produce pure drinking water, but the quality of the output water is relatively uniform. Furthermore, the human body needs a certain amount of minerals such as calcium and magnesium, but most water purifiers on the market generally have extremely low calcium and magnesium ion content and relatively high sodium ion content. Generally speaking, calcium and magnesium ions are necessary for the human body, but too much in drinking water will cause serious limescale problems when boiling water. High-quality drinking water should have a low sodium ion content. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention proposes a water purifier and water purification system with electrodialysis function, aiming to solve the problem that existing water purifiers generally have extremely low calcium and magnesium ion content and relatively high monovalent sodium ion content.

[0004] The technical solution proposed in this invention is:

[0005] A water purifier with electrodialysis function, the water purifier includes an electrodialysis water purification filter element, a drinking water pipe and a membrane filter element, the electrodialysis water purification filter element includes a cathode, an anode and an ion exchange module, the ion exchange module being disposed between the cathode and the anode;

[0006] The ion exchange module forms a divalent cation chamber and a monovalent cation chamber. The inlet of the divalent cation chamber and the monovalent cation chamber is connected to the pure water outlet of the membrane filter element, and the outlet of the divalent cation chamber is connected to the drinking water pipeline.

[0007] Under the influence of the electric fields of the anode and the cathode, monovalent cations in the divalent cation chamber migrate to the monovalent cation chamber, while divalent cations in the divalent cation chamber remain.

[0008] Furthermore, the electrodialysis water purification filter element includes a central tube, a shell, an upper end cover, and a lower end cover, all of which are located within the shell;

[0009] One end of the upper cover is connected to the upper end of the housing, and the other end is placed on the upper end of the ion exchange module. The upper cover and the upper end of the ion exchange module form a water inlet channel. The housing is provided with a third interface, which is connected to the water inlet channel.

[0010] The central tube is connected to the upper end of the housing. The central tube has an inner flow channel and an outer flow channel. The upper end of the housing is provided with a second interface and a first interface. The second interface is connected to the inner flow channel, and the first interface is connected to the outer flow channel.

[0011] The ion exchange module is arranged in a ring around the outer wall of the central tube, and the cathode is arranged between the inner wall of the ion exchange module and the outer wall of the central tube. The cathode and the inner wall of the ion exchange module form a cathode water chamber, which is connected to the outer flow channel.

[0012] The anode is located on the inner wall of the shell, and the anode and the outer wall of the ion exchange module form an anode water chamber;

[0013] The lower end cover is disposed at the lower end of the ion exchange module, and the lower end cover and the lower end of the ion exchange module form a product water flow channel. The product water flow channel is connected to the divalent cation chamber and the inner flow channel respectively. The lower end cover is provided with a connecting port, which is connected to the outer flow channel and the anode water chamber respectively.

[0014] The water inlet channel is connected to the divalent cation chamber and the monovalent cation chamber respectively. The monovalent cation chamber has at least two openings, at least one of which is connected to the cathode water chamber and at least the other of which is connected to the anode water chamber.

[0015] Furthermore, the ion exchange module includes a first grid, a selectively permeable cation membrane, a second grid, and an anion membrane. The first grid, the selectively permeable cation membrane, the second grid, and the anion membrane are stacked sequentially from the inside to the outside and spirally wound so that the first grid is stacked on the anion membrane. The selectively permeable cation membrane is a cation membrane that allows monovalent cations to pass through and retains divalent and higher cations.

[0016] Furthermore, the anal membrane and the selectively permeable cation membrane are sealed together at one end near the central tube.

[0017] Furthermore, the divalent cation chamber is composed of the selectively permeable cation membrane and the anion membrane, and the second grid is disposed within the divalent cation chamber.

[0018] Furthermore, the end of the divalent cation chamber away from the central tube is sealed with adhesive tape, while the end of the divalent cation chamber near the product water flow channel is not sealed with adhesive tape to form a first flow channel opening communicating with the product water flow channel.

[0019] Furthermore, the monovalent cation chamber is composed of the selectively permeable cation membrane and the anion membrane, with the first grid disposed within the monovalent cation chamber.

[0020] Furthermore, the end of the monovalent cation chamber furthest from the central tube is sealed with intermittent adhesive thread, and at least two of the openings are formed by the discontinuity of the intermittent adhesive thread; the end of the divalent cation chamber near the product water channel is sealed with adhesive thread.

[0021] Furthermore, the cathode water chamber is formed by the selectively permeable anolyte membrane, the cathode, and the first grid.

[0022] Furthermore, the anode water chamber is formed between the anion membrane and the anode.

[0023] Furthermore, the electrodialysis water purification filter element includes an anode wire and a cathode wire. One end of the anode wire is connected to the anode, and the other end passes through the housing for connection to the positive terminal of the power supply. One end of the cathode wire is connected to the cathode, and the other end passes through the housing for connection to the negative terminal of the power supply.

[0024] Furthermore, the water purifier includes a wastewater pipeline, which includes a first wastewater pipe, a second wastewater pipe, and a check valve. The first wastewater pipe is connected to the wastewater outlet of the membrane filter element, the first end of the second wastewater pipe is connected to the wastewater outlet of the monovalent cation chamber, the second end of the second wastewater pipe is connected to a branch of the first wastewater pipe, and the check valve is located on the second wastewater pipe.

[0025] Furthermore, the wastewater pipeline includes an electrode water pipeline, one end of which is connected to the outlet of the anode water chamber and the cathode water chamber respectively, and the other end is connected to a branch of the second wastewater pipeline. The branch of the second wastewater pipeline is located between the first end of the second wastewater pipeline and the check valve.

[0026] Furthermore, the wastewater pipeline includes a first flow limiting device and a second flow limiting device. The first flow limiting device is located in the ultra-high water pipeline, and the second flow limiting device is located in the second wastewater pipeline. The second flow limiting device is situated between the branch port of the second wastewater pipeline and the first end of the second wastewater pipeline.

[0027] Furthermore, the water purifier includes an inlet pipe, which includes an inlet conduit and a pressurizing device. The inlet conduit is connected to the inlet of the membrane filter element, and the pressurizing device is located in the inlet conduit.

[0028] The present invention also proposes a water purification system, including a water purifier with electrodialysis function. The water purifier includes an electrodialysis water purification filter element, a drinking water pipe and a membrane filter element. The electrodialysis water purification filter element includes a cathode, an anode and an ion exchange module, and the ion exchange module is placed between the cathode and the anode.

[0029] The ion exchange module forms a divalent cation chamber and a monovalent cation chamber. The inlet of the divalent cation chamber and the monovalent cation chamber is connected to the pure water outlet of the membrane filter element, and the outlet of the divalent cation chamber is connected to the drinking water pipeline.

[0030] Under the influence of the electric fields of the anode and the cathode, monovalent cations in the divalent cation chamber migrate to the monovalent cation chamber, while divalent cations in the divalent cation chamber remain.

[0031] According to the above technical solution, the beneficial effects of this invention are as follows: The pure water produced by the membrane filter is transported to the inlet of the electrodialysis water purifier, thus entering the divalent cation chamber and the monovalent cation chamber. When the electrodialysis water purifier is working, the concentration of divalent cations in the water flowing out of the divalent cation chamber remains unchanged, while the concentration of monovalent cations is greatly reduced. Meanwhile, the concentration of monovalent cations in the monovalent cation chamber increases. This means that monovalent cations in the divalent cation chamber are moved forward to the monovalent cation chamber, while divalent cations remain in the divalent cation chamber, thereby separating monovalent and divalent cations in the water and changing the water quality. Then, the pure water from the divalent cation chamber is transported to the drinking water pipeline for users to drink, solving the problem that existing water purifiers generally have extremely low calcium and magnesium ion content and relatively high monovalent sodium ion content. Attached Figure Description

[0032] Figure 1 This is a cross-sectional view of the electrodialysis water purification filter element provided in the embodiment of the present invention;

[0033] Figure 2 This is a cross-sectional view of the electrodialysis water purification filter element provided in the embodiments of the present invention;

[0034] Figure 3 This is a schematic diagram of water flow using the electrodialysis water purification filter element provided in the embodiments of the present invention;

[0035] Figure 4 This is a schematic diagram of the adhesive line of the electrodialysis water purification filter element provided in the embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of another adhesive line for the electrodialysis water purification filter element provided in the embodiments of the present invention;

[0037] Figure 6 This is a schematic diagram of another adhesive line for the electrodialysis water purification filter element provided in the embodiments of the present invention;

[0038] Figure 7 This is a schematic diagram of the structure of a water purifier with electrodialysis function provided in the embodiments of the present invention;

[0039] Figure 8This is a schematic diagram of a water purifier with electrodialysis function provided by another embodiment of the present invention.

[0040] Among them, the electrodialysis water purification filter element 1, cathode 11, cathode wire 111, anode 12, anode wire 121, ion exchange module 13, first grid 131, selective permeable cation membrane 132, second grid 133, anion membrane 134, and adhesive line 10.

[0041] Central tube 14, housing 15, first interface 151, second interface 152, third interface 153, upper end cover 16, lower end cover 17;

[0042] Drinking water pipe 3, membrane filter element 4, first wastewater pipe 21, second wastewater pipe 22, check valve 23, ultra-high water pipe 24, first flow limiting device 25, second flow limiting device 26, inlet pipe 27, booster device 28. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0044] like Figures 1 to 7 As shown in the figure, this embodiment of the invention proposes a water purifier with electrodialysis function. The water purifier includes an electrodialysis water purification filter element 1, a drinking water pipe 3, and a membrane filter element 4. The electrodialysis water purification filter element 1 includes a cathode 11, an anode 12, and an ion exchange module 13. The ion exchange module 13 is placed between the cathode 11 and the anode 12. A divalent cation chamber and a monovalent cation chamber are formed in the ion exchange module 13. The inlet of the divalent cation chamber and the monovalent cation chamber is connected to the pure water outlet of the membrane filter element 4, and the outlet of the divalent cation chamber is connected to the drinking water pipe 3. Under the action of the electric field of the anode 12 and the cathode 11, the monovalent cations in the divalent cation chamber migrate to the monovalent cation chamber, and the divalent cations in the divalent cation chamber are retained.

[0045] When the electrodialysis water purification filter element 1 is working, the current direction is from the positive electrode to the negative electrode. The cations in the electrodialysis water purification filter element 1 will move in the direction of the current, and the anions will move against the direction of the current.

[0046] Water enters the divalent cation chamber and the monovalent cation chamber respectively. Under the influence of the electric field, the monovalent cations in the divalent cation chamber enter the monovalent cation chamber, while the divalent cations cannot pass through and remain in the divalent cation chamber.

[0047] The pure water produced by membrane filter 4 is delivered to the inlet of electrodialysis water purifier 1, where it enters the divalent cation chamber and the monovalent cation chamber. When the electrodialysis water purifier 1 is working, the concentration of divalent cations in the water flowing out of the divalent cation chamber remains unchanged, while the concentration of monovalent cations decreases significantly. Meanwhile, the concentration of monovalent cations in the monovalent cation chamber increases. This means that monovalent cations in the divalent cation chamber are moved forward to the monovalent cation chamber, while divalent cations remain in the divalent cation chamber, thus separating monovalent and divalent cations in the water and changing the water quality. The pure water from the divalent cation chamber is then delivered to the drinking water pipeline for users to drink, solving the problem that existing water purifiers generally have extremely low calcium and magnesium ion content and relatively high monovalent sodium ion content.

[0048] In this embodiment, the electrodialysis water purification filter element 1 includes a central tube 14, a housing 15, an upper end cover 16, and a lower end cover 17, all of which are located inside the housing 15.

[0049] One end of the upper cap 16 is connected to the upper end of the housing 15, and the other end is placed on the upper end of the ion exchange module 13. The upper cap 16 and the upper end of the ion exchange module 13 form a water inlet channel. The housing 15 is provided with a third interface 153, which communicates with the water inlet channel. The third interface 153 is a water inlet end, used to connect to the pure water port of the membrane filter element.

[0050] Specifically, one end of the upper end cap 16 is connected to the upper end of the housing 15 in a sealed connection, and the other end of the end cap 16 is connected to the upper end of the ion exchange module 13 in a sealed connection.

[0051] The central tube 14 is connected to the upper end of the housing 15. The central tube 14 has an inner flow channel and an outer flow channel. The upper end of the housing 15 is provided with a second interface 152 and a first interface 151. The second interface 152 communicates with the inner flow channel, and the first interface 151 communicates with the outer flow channel. The second interface 152 is connected to a drinking water pipe to output water from the divalent cation chamber, and the first interface 151 is connected to a wastewater pipe to discharge water from the monovalent cation chamber.

[0052] In this embodiment, the central pipe 14 has two straight-through flow channels, an inner and an outer. The inner flow channel is complete, while the outer flow channel has an opening in the pipe wall away from the water inlet end, which is connected to the outside of the pipe wall.

[0053] Specifically, the connection between the central tube 14 and the upper end of the housing 15 is a sealed connection, and the inner flow channel and the outer flow channel are respectively connected to different inlet and outlet ports.

[0054] The ion exchange module 13 is arranged around the outer wall of the central tube 14. The cathode 11 is disposed between the inner wall of the ion exchange module 13 and the outer wall of the central tube 14. The cathode 11 and the inner wall of the ion exchange module 13 form a cathode 11 water chamber, which is connected to the external flow channel. The electrode water in the cathode 11 water chamber is discharged into the wastewater pipe through the external flow channel and the first interface 151.

[0055] The anode 12 is disposed on the inner side wall of the housing 15, and the anode 12 and the outer side wall of the ion exchange module 13 form an anode 12 water chamber.

[0056] The lower end cap 17 is installed on the lower end of the ion exchange module 13, forming a product water flow channel with the lower end of the ion exchange module 13. The product water flow channel is connected to the divalent cation chamber and the inner flow channel, respectively. The lower end cap 17 has a connecting port, which is connected to the outer flow channel and the anode 12 water chamber, respectively. Water from the divalent cation chamber is transported to the drinking water pipeline through the product water flow channel, the inner flow channel, and the second interface 152. Electrode water from the anode 12 water chamber enters the outer flow channel through the connecting port, and then is discharged to the wastewater pipeline through the first interface 151.

[0057] Specifically, the lower end cap 17 is sealed to the lower end of the ion exchange module 13 and is also sealed to the inner and outer flow channels of the central tube.

[0058] The inlet channel is connected to the divalent cation chamber and the monovalent cation chamber, respectively. The monovalent cation chamber has at least two openings, at least one of which is connected to the cathode 11 water chamber, and at least the other opening is connected to the anode 12 water chamber. In this embodiment, the specific number of the at least two openings is two. Pure water enters the inlet channel through the third interface 153, and then flows into the divalent cation chamber and the monovalent cation chamber, respectively. The monovalent cations in the monovalent cation chamber migrate to the divalent cation chamber, and then the water in the monovalent cation chamber enters the cathode 11 water chamber and the anode 12 water chamber through the two openings, respectively.

[0059] In some embodiments, the water inlet channel may also be connected to the cathode 11 water chamber and the anode 12 water chamber.

[0060] In this embodiment, the ion exchange module 13 includes a first grid 131, a selectively permeable cation exchange membrane 132, a second grid 133, and an anion exchange membrane 134. The first grid 131, the selectively permeable cation exchange membrane 132, the second grid 133, and the anion exchange membrane 134 are stacked sequentially from the inside out and spirally wound so that the first grid 131 is stacked on top of the anion exchange membrane 134. The selectively permeable cation exchange membrane 132 is a cation exchange membrane that allows monovalent cations to pass through while retaining divalent and higher-valent cations. Both the first grid 131 and the second grid 133 are used to form water channels separating the selectively permeable cation exchange membrane 132, the anion exchange membrane 134, and the cathode 11. The selectively permeable cation exchange membrane 132 can retain anions and divalent cations while allowing monovalent cations to pass through; the anion exchange membrane 134 retains cations while allowing anions to pass through. Furthermore, the ion exchange module 13 has a spiral configuration, which, when placed inside a cylindrical filter cartridge, allows it to withstand higher water pressure and improves manufacturability.

[0061] In this embodiment, the anion membrane 134 and the selectively permeable cation membrane 132 are sealed together at the ends near the central tube 14. That is, the starting end of the spiral configuration is sealed together.

[0062] In this embodiment, the divalent cation chamber is composed of the selectively permeable cation membrane 132 and the anion membrane 134, and the second grid 133 is disposed within the divalent cation chamber. The divalent cation chamber is formed by the selectively permeable cation membrane 132, the anion membrane 134, and the second grid 133 sandwiched between the selectively permeable cation membrane 132 and the anion membrane 134.

[0063] In this embodiment, the end of the divalent cation chamber away from the central tube 14 is sealed with adhesive thread 10, while the end of the divalent cation chamber near the product water flow channel is not sealed with adhesive thread 10 to form a first flow channel opening communicating with the product water flow channel. That is, at the end of the spiral configuration, the divalent cation chamber is sealed, but the end of the divalent cation chamber near the product water flow channel is not sealed with adhesive thread 10 to form a first flow channel opening communicating with the product water flow channel, and the end of the divalent cation chamber near the inlet water flow channel is also not sealed with adhesive thread 10 to communicate with the inlet water flow channel.

[0064] In this embodiment, the monovalent cation chamber is composed of the selectively permeable cation membrane 132 and the anion membrane 134, and the first grid 131 is disposed within the monovalent cation chamber. The monovalent cation chamber is formed by the selectively permeable cation membrane 132, the anion membrane 134, and the first grid 131 sandwiched between the selectively permeable cation membrane 132 and the anion membrane 134.

[0065] In this embodiment, the end of the monovalent cation chamber away from the central tube 14 is sealed with intermittent adhesive line 10, and at least two openings are formed by the discontinuity of the intermittent adhesive line 10. The end of the divalent cation chamber near the product water flow channel is also sealed with adhesive line 10. That is, at the end of the spiral configuration, the monovalent cation chamber is connected by intermittent adhesive line 10. Because it is intermittent adhesive line 10, a gap is formed, which is the opening mentioned above. The two openings allow the water from the monovalent cation chamber to flow out in two directions. One direction is to mix with the water from the cathode 11 and enter the outer flow channel of the central tube 14 through the opening. The other direction is to flow out from the end away from the central tube 14 through the gap in the adhesive line 10, mix with the water from the anode 12, and then enter the outer flow channel of the central tube 14. After merging with another part of the monovalent cation water from the cathode 11, it flows out from the first interface 151. The end of the divalent cation chamber near the product water channel is not sealed with adhesive line 10 to form a first flow channel opening communicating with the product water channel, and the end of the divalent cation chamber near the inlet water channel is also not sealed with adhesive line 10 so as to communicate with the inlet water channel.

[0066] In this embodiment, the cathode 11 water chamber is formed by the selectively permeable cation membrane 132, the cathode 11, and the first grid 131, and the anode 12 water chamber is formed between the anion membrane 134 and the anode 12. The first grid 131 is sandwiched between the selectively permeable cation membrane 132 and the cathode 11.

[0067] In this embodiment, the electrodialysis water purification filter element 1 includes an anode wire 121 and a cathode wire 111. One end of the anode wire 121 is connected to the anode 12, and the other end passes through the housing 15 for connection to the positive terminal of the power supply. One end of the cathode wire 111 is connected to the cathode 11, and the other end passes through the housing 15 for connection to the negative terminal of the power supply.

[0068] In this embodiment, the water purifier includes a wastewater pipeline, which comprises a first wastewater pipe 21, a second wastewater pipe 22, and a check valve 23. The first wastewater pipe 21 is connected to the wastewater outlet of the membrane filter element 4. The first end of the second wastewater pipe 22 is connected to the wastewater outlet of the monovalent cation chamber, and the second end of the second wastewater pipe 22 is connected to a branch port of the first wastewater pipe 21. The check valve 23 is located on the second wastewater pipe 22. The wastewater from the membrane filter element 4 and the wastewater from the electrodialysis water purification filter element 1 are both connected to the first wastewater pipe 21 and then discharged through the first wastewater pipe 21.

[0069] In this embodiment, the wastewater pipeline includes an electrode water pipeline 24. One end of the electrode water pipeline 24 is connected to the outlet of the anode water chamber and the cathode water chamber, respectively, and the other end is connected to a branch of the second wastewater pipeline 22. The branch of the second wastewater pipeline 22 is located between the first end of the second wastewater pipeline 22 and the check valve 23. The wastewater from the electrodialysis water purification filter element 1 is connected to the second wastewater pipeline 22, and then to the first wastewater pipeline 21. In this way, the wastewater from the membrane filter element 4, the wastewater from the electrodialysis water purification filter element 1, and the electrode water from the wastewater of the electrodialysis water purification filter element 1 are all discharged through the first wastewater pipeline 21.

[0070] like Figure 8 As shown, in some embodiments, the wastewater pipeline includes a first flow-limiting device 25 and a second flow-limiting device 26. The first flow-limiting device 25 is located on the electro-water pipeline 24, and the second flow-limiting device 26 is located on the second wastewater pipeline 22. The second flow-limiting device 26 is located between the branch port of the second wastewater pipeline 22 and the first end of the second wastewater pipeline 22. The purpose of installing the first flow-limiting device 25 and the second flow-limiting device 26 on the electro-water pipeline 24 and the second wastewater pipeline 22 is to reduce the flow rate of electro-water and wastewater, reduce the amount of wastewater ultimately discharged, and improve the utilization rate of raw water.

[0071] In this embodiment, the water purifier includes an inlet pipe, which includes an inlet pipe 27 and a booster device 28. The inlet pipe 27 is connected to the inlet of the membrane filter element 4, and the booster device 28 is located in the inlet pipe 27.

[0072] The function of the booster device 28 is to increase the pressure of the raw water to reach the water production working pressure of the membrane filter element.

[0073] The function of membrane filter element 4 is to remove some ions from the water and prepare pure water. The removal rate of monovalent ions in membrane filter element 4 is 10%-80%, and the removal rate of divalent ions is 30-80%.

[0074] The function of the electrodialysis water purification filter cartridge 1 is to retain divalent ions in the pure water prepared by the membrane filter cartridge 4 and remove monovalent ions. The removal rate of monovalent ions by the electrodialysis water purification filter cartridge is 50%-100%, and the removal rate of divalent ions is 0-20%.

[0075] Water purifiers preferably use nanofiltration membranes or reverse osmosis membranes with low desalination rates for the membrane filter cartridges to ensure that the output water contains a certain amount of divalent ions.

[0076] Without scaling, the system retains the calcium and magnesium ions needed by the human body in the original water while removing more monovalent ions (mainly sodium ions), making the water more in line with the requirements for healthy water use.

[0077] In summary, the inlet pipe 27 connects to the raw water supply. Under the pressure boosting effect of the booster device 28, the raw water is transported to the membrane filter 4 for filtration. The pure water filtered by the membrane filter 4 is then transported to the electrodialysis water purification filter 1. In the electrodialysis water purification filter 1, the monovalent cations in the divalent cation chamber move forward to the monovalent cation chamber, while the divalent cations remain in the divalent cation chamber, thus separating the monovalent and divalent cations in the water and changing the water quality. The pure water in the divalent cation chamber is then transported to the drinking water pipe 3 for users to drink.

[0078] This invention also proposes a water purification system, including a water purifier with electrodialysis function. The water purifier includes an electrodialysis water purification filter element 1, a drinking water pipe 3, and a membrane filter element 4. The electrodialysis water purification filter element 1 includes a cathode 11, an anode 12, and an ion exchange module 13. The ion exchange module 13 is placed between the cathode 11 and the anode 12. A divalent cation chamber and a monovalent cation chamber are formed within the ion exchange module 13. The inlet ends of the divalent cation chamber and the monovalent cation chamber are connected to the pure water outlet of the membrane filter element 4, and the outlet end of the divalent cation chamber is connected to the drinking water pipe 3. Under the action of the electric field of the anode 12 and the cathode 11, the monovalent cations in the divalent cation chamber migrate to the monovalent cation chamber, while the divalent cations in the divalent cation chamber are retained.

[0079] When the electrodialysis water purification filter element 1 is working, the current direction is from the positive electrode to the negative electrode. The cations in the electrodialysis water purification filter element 1 will move in the direction of the current, and the anions will move against the direction of the current.

[0080] Water enters the divalent cation chamber and the monovalent cation chamber respectively. Under the influence of the electric field, the monovalent cations in the divalent cation chamber enter the monovalent cation chamber, while the divalent cations cannot pass through and remain in the divalent cation chamber.

[0081] The pure water produced by membrane filter 4 is delivered to the inlet of electrodialysis water purifier 1, where it enters the divalent cation chamber and the monovalent cation chamber. When the electrodialysis water purifier 1 is working, the concentration of divalent cations in the water flowing out of the divalent cation chamber remains unchanged, while the concentration of monovalent cations decreases significantly. Meanwhile, the concentration of monovalent cations in the monovalent cation chamber increases. This means that monovalent cations in the divalent cation chamber are moved forward to the monovalent cation chamber, while divalent cations remain in the divalent cation chamber, thus separating monovalent and divalent cations in the water and changing the water quality. The pure water from the divalent cation chamber is then delivered to the drinking water pipeline for users to drink, solving the problem that existing water purifiers generally have extremely low calcium and magnesium ion content and relatively high monovalent sodium ion content.

[0082] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A water purifier with electrodialysis function, characterized in that, The water purifier includes an electrodialysis water purification filter element, a drinking water pipe, and a membrane filter element. The membrane filter element is a nanofiltration membrane or a reverse osmosis membrane. The removal rate of monovalent ions in the membrane filter element is 10%-80%, and the removal rate of divalent ions is 30-80%. The electrodialysis water purification filter element includes a cathode, an anode, and an ion exchange module. The ion exchange module is placed between the cathode and the anode. The ion exchange module forms a divalent cation chamber and a monovalent cation chamber. The inlet of the divalent cation chamber and the monovalent cation chamber is connected to the pure water outlet of the membrane filter element, and the outlet of the divalent cation chamber is connected to the drinking water pipeline. Under the influence of the electric fields of the anode and the cathode, monovalent cations in the divalent cation chamber migrate to the monovalent cation chamber, while divalent cations in the divalent cation chamber remain. The electrodialysis water purification filter element includes a shell and an upper end cover, a central tube, and a lower end cover located within the shell. The central tube is connected to the upper end of the shell and has an inner flow channel and an outer flow channel. The upper end of the shell is provided with a first interface and a second interface. The second interface communicates with the inner flow channel, and the first interface communicates with the outer flow channel. One end of the upper end cover is connected to the upper end of the shell, and the other end is placed on the upper end of the ion exchange module. The upper end cover and the upper end of the ion exchange module form an inlet flow channel. The shell is provided with a third interface, which communicates with the inlet flow channel. The lower end cover is placed on the lower end of the ion exchange module, and the lower end cover and the lower end of the ion exchange module form a product water flow channel. The ion exchange module is arranged in a ring around the outer wall of the central tube, and the cathode is arranged between the inner wall of the ion exchange module and the outer wall of the central tube. The cathode and the inner wall of the ion exchange module form a cathode water chamber, which is connected to the outer flow channel. The anode is located on the inner wall of the shell, and the anode and the outer wall of the ion exchange module form an anode water chamber; The product water flow channel is connected to the divalent cation chamber and the inner flow channel respectively. The lower end cover is provided with a connecting port, which is connected to the outer flow channel and the anode water chamber respectively. The inlet water flow channel is connected to the divalent cation chamber and the monovalent cation chamber respectively. The monovalent cation chamber is provided with at least two openings, at least one of which is connected to the cathode water chamber and at least another opening is connected to the anode water chamber. The end of the monovalent cation chamber away from the central tube is sealed with intermittent adhesive line. The opening connected to the anode water chamber is formed by the gap of the intermittent adhesive line. The end of the monovalent cation chamber near the product water flow channel is sealed with adhesive line. The ion exchange module includes a first grid, a selectively permeable cation membrane, a second grid, and an anion membrane. The first grid, the selectively permeable cation membrane, the second grid, and the anion membrane are stacked sequentially from the inside to the outside and spirally wound so that the first grid is stacked on the anion membrane. The selectively permeable cation membrane is a cation membrane that allows monovalent cations to pass through and retains divalent and higher cations.

2. The water purifier with electrodialysis function according to claim 1, characterized in that, The anion membrane and the selectively permeable cation membrane are sealed together at one end near the central tube.

3. The water purifier with electrodialysis function according to claim 2, characterized in that, The divalent cation chamber is composed of the selectively permeable cation membrane and the anion membrane, and the second grid is disposed in the divalent cation chamber.

4. The water purifier with electrodialysis function according to claim 3, characterized in that, The end of the divalent cation chamber away from the central tube is sealed with adhesive tape, while the end of the divalent cation chamber near the product water channel is not sealed with adhesive tape to form a first channel opening communicating with the product water channel.

5. The water purifier with electrodialysis function according to claim 1, characterized in that, The monovalent cation chamber is composed of the selectively permeable cation membrane and the anion membrane, with the first grid disposed within the monovalent cation chamber.

6. The water purifier with electrodialysis function according to claim 1, characterized in that, The cathode water chamber is formed by the selectively permeable cation membrane, the cathode, and the first grid.

7. The water purifier with electrodialysis function according to claim 1, characterized in that, The anolyte chamber is formed between the anion membrane and the anode.

8. The water purifier with electrodialysis function according to claim 1, characterized in that, The electrodialysis water purification filter element includes an anode wire and a cathode wire. One end of the anode wire is connected to the anode, and the other end passes through the housing for connection to the positive terminal of the power supply. One end of the cathode wire is connected to the cathode, and the other end passes through the housing for connection to the negative terminal of the power supply.

9. The water purifier with electrodialysis function according to claim 1, characterized in that, The water purifier includes a wastewater pipeline, which includes a first wastewater pipe, a second wastewater pipe, and a check valve. The first wastewater pipe is connected to the wastewater outlet of the membrane filter element. The first end of the second wastewater pipe is connected to the wastewater outlet of the monovalent cation chamber. The second end of the second wastewater pipe is connected to a branch of the first wastewater pipe. The check valve is located on the second wastewater pipe.

10. The water purifier with electrodialysis function according to claim 9, characterized in that, The wastewater pipeline includes an electrode water pipeline, one end of which is connected to the outlet of the anode water chamber and the cathode water chamber respectively, and the other end is connected to a branch of the second wastewater pipeline. The branch of the second wastewater pipeline is located between the first end of the second wastewater pipeline and the check valve.

11. The water purifier with electrodialysis function according to claim 10, characterized in that, The wastewater pipeline includes a first flow limiting device and a second flow limiting device. The first flow limiting device is located in the wastewater pipeline, and the second flow limiting device is located in the second wastewater pipeline. The second flow limiting device is located between the branch port of the second wastewater pipeline and the first end of the second wastewater pipeline.

12. The water purifier with electrodialysis function according to claim 1, characterized in that, The water purifier includes an inlet pipe, which includes an inlet pipe and a pressurizing device. The inlet pipe is connected to the inlet of the membrane filter element, and the pressurizing device is located in the inlet pipe.

13. A water purification system, characterized in that, Including water purifiers with electrodialysis function as described in any one of claims 1-12.

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